hv.render-based MPL rendering weirdness when it is not included as an extension

[zbarry]

After adding some code to a notebook that performs matplotlib-based export of some of my plots but forgetting to add MPL as a backend via hv.extension('bokeh', 'matplotlib'), PNGs were successfully exported via the MPL backend, but the main HV backend also then switched from Bokeh to matplotlib. If 'matplotlib' is included in hv.extension, as it should be, this problem does not occur. I guess this is a case of HoloViews interacting weirdly with user error.

%matplotlib inline

import holoviews as hv
import numpy as np

hv.extension('bokeh', 'matplotlib')  # OR without matplotlib

im_hv = hv.Image(np.random.randint(0, 10, size=(512, 512)))
display(im_hv)
display(hv.render(im_hv, backend='matplotlib'))
display(im_hv)

Including both backends as extensions:

Without including matplotlib:

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